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Derivative Instruments and Hedging Activities - Realized and Unrealized Gains (Losses) on Commodity Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ (52) $ 33 $ (327) $ 415
Total deferred gains/(losses) 55 82 (385) 170
Net deferred gains/(losses) 3 115 (712) 585
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 37 26 95
Gas purchased for resale        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 (3) 4 3
Non-utility        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 (6) 17 (22)
Other operations and maintenance expense        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 2 0 5
Other interest expense        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 44 5 109
Deferred Derivative Gains, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (61) 10 (210) 348
Deferred Derivative Gains, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 9 23 (117) 67
Deferred Derivative Losses, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 40 46 25 10
Recoverable Energy Costs, Current        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (84) 32 (376) 190
Deferred Derivative Losses, Noncurrent        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 99 4 (34) (30)
CECONY | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (49) 28 (298) 381
Total deferred gains/(losses) 52 77 (364) 154
Net deferred gains/(losses) 3 105 (662) 535
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 2 0 5
CECONY | Gas purchased for resale | Subsidiaries        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Non-utility | Subsidiaries        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Other operations and maintenance expense | Subsidiaries        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 2 0 5
CECONY | Other interest expense | Subsidiaries        
Pre-tax gains/(losses) recognized in income        
Total pre-tax gains/(losses) recognized in income 0 0 0 0
CECONY | Deferred Derivative Gains, Current | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (57) 8 (194) 319
CECONY | Deferred Derivative Gains, Noncurrent | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 8 20 (104) 62
CECONY | Deferred Derivative Losses, Current | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) 37 40 25 9
CECONY | Recoverable Energy Costs, Current | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) (81) 30 (355) 172
CECONY | Deferred Derivative Losses, Noncurrent | Subsidiaries        
Pre-tax gains/(losses) deferred in accordance with accounting rules for regulated operations:        
Total deferred gains/(losses) $ 96 $ 7 $ (34) $ (27)